PyTREX is an open source implementation of TREX
written in Python. TREX (Tree Regular Expressions
for XML) is a simple but powerful schema language
for XML.
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This release includes support and tests for
pattern inclusion, grammar merging (partial),
named datatypes, "not", "difference", "choice" in
nameclasses, "nsName", "anyName", "notAllowed",
namespaces, qnames, trex namespace, and changes to
the py file to allow it to be importable.